Lured by promise of stem cells, Dallas-Fort Worth residents head abroad for medical treatment

An increasing number of U.S. residents are traveling abroad for a controversial stem cell treatment that are unavailable in this country. Some U.S. researchers worry about the rise in "stem cell tourism" as foreign clinics promote treatments for multiple sclerosis, Alzheimer's disease, and a host of other illnesses. They contend that foreign doctors are pitching risky procedures on the Internet to vulnerable patients, with no science to back up their claims.